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2. Block and tackle - Wikipedia

   en.wikipedia.org/wiki/Block_and_tackle

   A block and tackle [1] [2] or only tackle [3] is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads.. The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and one moves with the load.

3. Belt friction - Wikipedia

   en.wikipedia.org/wiki/Belt_friction

   The equation used to model belt friction is, assuming the belt has no mass and its material is a fixed composition: [2] = where is the tension of the pulling side, is the tension of the resisting side, is the static friction coefficient, which has no units, and is the angle, in radians, formed by the first and last spots the belt touches the pulley, with the vertex at the center of the pulley.

4. Z-drag - Wikipedia

   en.wikipedia.org/wiki/Z-drag

   A Z-Drag or Z-Rig is an arrangement of lines and pulleys, effectively forming a block and tackle, that is commonly used in rescue situations. [1] The basic arrangement results in pulling the hauling end 3 times the distance the load is moved, providing a theoretical mechanical advantage of three to one .

5. Line shaft - Wikipedia

   en.wikipedia.org/wiki/Line_shaft

   For example, a 40" pulley at 100 rpm would turn a 20" pulley at 200 rpm. Pulleys solidly attached ("fast") to the shaft could be combined with adjacent pulleys that turned freely ("loose") on the shaft (idlers). In this configuration the belt could be maneuvered onto the idler to stop power transmission or onto the solid pulley to convey the power.

6. Prusik - Wikipedia

   en.wikipedia.org/wiki/Prusik

   A somewhat longer loop than the normal Prusik is used around the rope, then a second Prusik is used around the cord loop itself to form a foot loop. The foot loop is then easily adjusted in length and position. A Prusik-Minding-Pulley is common in rope rescue. The rope to be pulled is passed through a pulley, and a Prusik is tied on the loaded ...

7. Mechanical advantage - Wikipedia

   en.wikipedia.org/wiki/Mechanical_advantage

   The rope is threaded through the pulleys to provide mechanical advantage that amplifies that force applied to the rope. [ 4 ] In order to determine the mechanical advantage of a block and tackle system consider the simple case of a gun tackle, which has a single mounted, or fixed, pulley and a single movable pulley.